Experimental and numerical investigation of diffuse instability in granular materials using a microstructural model under various loading paths - Université de Lorraine Access content directly
Journal Articles Geotechnique Year : 2013

Experimental and numerical investigation of diffuse instability in granular materials using a microstructural model under various loading paths

Abstract

Depending on stress state and loading conditions, instability in loose sand can develop at a shear stress level much lower than the Mohr-Coulomb failure criterion. This type of failure mode, very different from strain-softening in dense sand, can lead to catastrophic collapse of earth structures. An appropriate constitutive model is therefore needed that can capture the correct failure modes and accurately predict the stress-strain response for both dense and loose sands. In this paper, a micromechanical approach developed earlier for the modelling of granular material behaviour is adopted. The constitutive model is utilised to simulate undrained triaxial, constant-q and proportional strain tests on loose sand, and numerical results are compared with experimental results. The model is capable of accurately reproducing the macroscopic experimental tests, and is also able to provide microstructural information. This enables the observation of instability at the particle scale, and provides a better understanding of the linkage between particle-scale instability and instability at the assembly level.
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Dates and versions

hal-01501440 , version 1 (18-04-2017)

Licence

Public Domain

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Ali Daouadji, Pierre-Yves Hicher, Mohamad Jrad, Beena Sukumaran, Salim Belouettar. Experimental and numerical investigation of diffuse instability in granular materials using a microstructural model under various loading paths. Geotechnique, 2013, 63 (5), pp.368-381. ⟨10.1680/geot.10.P.121⟩. ⟨hal-01501440⟩
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